WO2013021639A1

WO2013021639A1 - Airtight container, method for producing same and vacuum insulation body

Info

Publication number: WO2013021639A1
Application number: PCT/JP2012/005044
Authority: WO
Inventors: 将裕越山; 湯淺　明子; 真弥小島; 高野　隆司; 一浩川西; 山本　直樹; 昌道橋田
Original assignee: パナソニック株式会社
Priority date: 2011-08-09
Filing date: 2012-08-08
Publication date: 2013-02-14
Also published as: JP5356617B2; JP5356585B2; CN103732111A; JP2013208615A; JP2013100912A; JP6041214B2; US20140178613A1; JP2013091527A; JP5356618B2; JP2013130294A; EP2742835A1; JP2013068323A; JP5356619B2

Abstract

An airtight container (1) has an opening (5) and is provided with a metal container (3) having a depressurized first interior space, a solid matter (4) contained in the first interior space of the metal container and a sealing member (2) composed of glass containing at least one of an alkali earth metal oxide and an alkali metal oxide. The sealing member is heated and melted after which it is cooled and solidified, thus being joined to the opening of the metal container to seal the opening.

Description

Sealed container, method for manufacturing the same, and vacuum insulator

The present invention relates to a hermetic container, a method for manufacturing the same, and a vacuum heat insulator, and in particular, a hermetic container in which an opening of a metal container in which a solid is housed in a reduced internal space is sealed with a sealing member; The present invention relates to a method for manufacturing the hermetic container, and a vacuum heat insulating body including the hermetic container in a decompressed internal space of a hollow jacket member.

In recent years, there has been an active movement to promote energy conservation as a countermeasure against global warming, which is a global environmental problem. For this reason, vacuum heat insulators having excellent heat insulation performance are also demanded from the viewpoint of effective use of heat with regard to equipment for heating and cooling heat.

The vacuum heat insulator is formed, for example, by storing a core member such as glass wool in the laminated bag interior space, decompressing the bag interior space, and sealing the bag. The core member has a high gas phase volume ratio, and many fine voids are formed in the internal space of the bag. When the void diameter of the core member is smaller than the mean free path of gas molecules under reduced pressure, the size of the gas molecules (gas heat conduction component) that conducts heat is reduced. In particular, when the gap diameter of the core member is very fine, for example, about 1 mm, the heat conduction by the convective gas molecules becomes so small that it can be ignored. Furthermore, near room temperature, the ratio of the radiant heat from the radiant material contributing to the thermal conductivity is very small. Therefore, the heat conduction in the vacuum heat insulating body is dominated by the solid heat conduction component of the core member and the slightly remaining gas heat conduction component. For this reason, it is supposed that the heat conductivity of a vacuum heat insulating body is very small compared with other heat insulating materials.

For such a high-performance vacuum insulator, even a slight amount of air entering the internal space through the laminated bag is an important factor that degrades the heat insulation. Therefore, it has been proposed to further store the gas adsorption device together with the core member in the internal space of the bag. Thereby, since a gas adsorption | suction device adsorb | sucks the trace amount gas heat conductive component which penetrate | invaded internal space, the heat insulation performance of a vacuum heat insulating body is maintained. For this reason, the gas adsorption device is required to have very high gas adsorption performance. In particular, a method for maintaining the performance of the gas adsorption device by opening the sealing member of the gas adsorption device in the internal space of the vacuum heat insulator has been proposed.

Also, as with such a gas adsorption device, a sealing glass technique for sealing a container in a vacuum state has been proposed.

In the metal vacuum double container shown in Patent Document 1, a double container is formed by joining an inner and outer container having an exhaust port to one of a metal inner container and an outer container. A sealing material made of low-temperature molten glass having a softening temperature of 200 to 600 ° C. is disposed in the vicinity of the exhaust port. Then, the double container is arranged in a vacuum heating furnace and evacuated so that the gap between the inner and outer containers of the double container is in a vacuum state at a temperature lower than the softening temperature of the sealing material. Next, when the double container is heated to a temperature higher than the softening temperature of the sealing material, the sealing material softens and seals the exhaust port.

Also, in the metal double container shown in Patent Document 2, a composition of sealing glass for sealing the exhaust port of the vacuum double container has been proposed.

Furthermore, in the metal double container shown in Patent Document 3, as the sealing glass for sealing the exhaust port of the vacuum double container, the amount of gas generated from the sealing glass during sealing is low. Has been proposed.

JP-A-6-169850 JP 2002-125866 A JP-A-2005-319150

However, any of the metal double containers described in Patent Documents 1 to 3 is used as a thermos bottle. For this reason, since it is not envisaged that a solid material is installed in the vacuum space between the double containers, the force that the sealing glass is joined to the exhaust port is greater than when a solid material is installed in the vacuum space. It may be small. For this reason, if a solid substance is installed in the vacuum space, gas and moisture contained in the solid substance are desorbed in the vacuum sealing process. These desorbed substances increase the pressure in the vacuum space, and the gas in the vacuum space passes through the periphery of the sealing glass and is discharged. Thereby, the force which the sealing glass seals in vacuum decreases, and the degree of vacuum in the vacuum space decreases.

The present invention has been made in order to solve such problems, and a sealed container in which a decrease in the degree of vacuum in an internal space containing solids is suppressed, a method for manufacturing the same, and a vacuum insulation using the sealed container The purpose is to provide a body.

An airtight container according to an aspect of the present invention has an opening, a metal container whose first internal space is decompressed, a solid material housed in the first internal space of the metal container, an alkali A sealing member made of glass containing at least one of an earth metal oxide and an alkali metal oxide, and the sealing member is heated and melted to be cooled and solidified, whereby the opening of the metal container And the opening is sealed.

Advantageous Effects of Invention According to the present invention, there is provided an effect that it is possible to provide a sealed container in which a decrease in the degree of vacuum in an internal space containing solids is suppressed, a method for manufacturing the same, and a vacuum insulator using the sealed container. Play.

The above object, other objects, features, and advantages of the present invention will become apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings.

It is a perspective view which shows the airtight container which concerns on Embodiment 1 of this invention. It is a perspective view which shows the state in which the solid substance was accommodated in the metal container used for the airtight container of FIG. It is a perspective view which shows the state which crushed the metal container of FIG. 2 substantially flat. It is a perspective view which shows the state which inserted the sealing member in the opening part of the metal container of FIG. It is a perspective view which shows the airtight container which concerns on the modification 1 of Embodiment 1 of this invention. It is a perspective view which shows the airtight container which concerns on the modification 2 of Embodiment 1 of this invention. It is sectional drawing which shows the vacuum heat insulating body which concerns on Embodiment 2 of this invention. It is a perspective view which shows the gas adsorption | suction device accommodated in the vacuum heat insulating body of FIG. It is a perspective view which shows the state by which the gas adsorption device of FIG. 8 was bent. It is sectional drawing which shows the vacuum heat insulating body which concerns on the modification 3 of Embodiment 2 of this invention. It is sectional drawing which shows the vacuum heat insulating body which concerns on the modification 3 of Embodiment 2 of this invention. It is sectional drawing which shows the vacuum heat insulating body which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the vacuum heat insulating body which concerns on the modification 9 of Embodiment 3 of this invention.

A sealed container according to a first aspect of the present invention has an opening, a metal container whose first inner space is decompressed, a solid material accommodated in the first inner space of the metal container, and alkaline earth A sealing member made of glass containing at least one of a metal oxide and an alkali metal oxide, and the sealing member is heated and melted and cooled and solidified to form an opening in the metal container. It joins and the said opening part is sealed.

According to this configuration, the alkaline earth metal oxide or alkali metal oxide contained in the glass of the sealing member is chemically bonded to the metal oxide formed on the surface of the opening of the metal container by the heat treatment. As a result, the sealing member and the opening are firmly joined, so that the airtightness of the airtight container is kept high even if the solid matter is stored inside the metal container.

In the sealed container according to the second invention, in the first invention, the alkaline earth metal oxide of the sealing member may be either BaO or SrO.

According to this configuration, BaO and SrO among the alkaline earth metals are strongly and strongly chemically bonded to the metal oxide, so that the sealing member is firmly joined to the opening of the metal container. Thereby, the airtight container can maintain the outstanding airtightness.

The metal container according to a third invention is the first or second invention, wherein the sealing member is located inside the opening and joined to the opening, and the metal container is You may have a thermal expansion coefficient larger than the thermal expansion coefficient of the said sealing member.

According to this configuration, the metal container expanded by the cooling process after the heat treatment contracts more than the sealing member. For this reason, the opening part of a metal container clamp | tightens the sealing member located in the inside of an opening part, and these are joined firmly mechanically. Thereby, the airtight container can maintain the outstanding airtightness.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the metal container may be made of aluminum.

According to this configuration, the metal container made of aluminum is larger than the thermal expansion coefficient of the sealing member, and the sealing member is firmly mechanically joined to the opening of the metal container. Thereby, the airtight container can maintain the outstanding airtightness.

The sealed container according to a fifth aspect of the present invention is the sealed container according to any one of the first to fourth aspects, wherein a constriction is provided in the opening of the metal container, and the sealing member is joined to the constriction. The part may be sealed.

According to this configuration, when the metal container in which the sealing member is located inside the opening is heat-treated, the molten sealing member is held in the narrowed portion by the surface tension. For this reason, the mechanism which supports the melt | dissolved sealing member is unnecessary, and the sealing member can seal a constriction part by simple structure.

The sealed container according to a sixth invention may include a gas adsorbing material in which the solid matter does not deteriorate by heat treatment in any one of the first to fifth inventions, and may function as a gas adsorbing device.

According to this configuration, even if the heat treatment for sealing the opening of the metal container with the sealing member is performed on the solid material, the solid material does not deteriorate. For this reason, the solid substance can exhibit its function as a gas adsorbent in the sealed container.

A vacuum heat insulating body according to a seventh aspect of the present invention accommodates a gas adsorbing device including the sealed container of the sixth aspect, a core member, the gas adsorbing device and the core member in the second internal space. And a hollow outer cover member in which the second inner space is decompressed and sealed.

According to this configuration, since the gas adsorption device is hermetically sealed, the gas adsorption performance is maintained high. When the gas adsorbing device is opened inside the jacket member, the gas heat conduction component remaining or entering the second internal space is adsorbed by the gas adsorbing device, and the degree of vacuum of the second internal space is maintained high. . Thereby, a vacuum heat insulating body can exhibit the outstanding heat insulation.

According to an eighth aspect of the present invention, in the seventh aspect, the through hole that opens the gas adsorbing device is formed when the sealing member is destroyed in the second internal space of the jacket member. It may be.

According to this configuration, it is not necessary to separately provide a mechanism for penetrating the sealing member, and the gas adsorbing device is reliably opened with a simple structure.

In a vacuum heat insulator according to a ninth invention, in the eighth invention, the opening of the metal container is formed in a cylindrical shape having a substantially flat cross section, and the short axis direction of the substantially flat cross section in the opening. The through hole may be formed by applying an external force to the sealing member and destroying the sealing member.

According to this configuration, an external force is applied in the short axis direction of the substantially flat cross section to the opening formed in the cylindrical shape including the substantially flat cross section. Thereby, since an opening part is easy to deform | transform, a sealing member is destroyed easily. As a result, the gas adsorption device is reliably opened with a simple structure.

In a vacuum heat insulator according to a tenth invention, in the seventh to ninth inventions, the gas adsorbing device is housed in the core member, and the core member is interposed between the jacket member and the gas adsorbing device. It may be interposed.

According to this configuration, when the sealing member is broken by an external force and the gas adsorption device is opened, the external force is relieved by the core member between the jacket member and the gas adsorption device. Accordingly, the broken pieces of the sealing member are not scattered on the core member. For this reason, when disassembling the vacuum heat insulator, each member can be easily separated and the vacuum heat insulator can be easily recycled.

The vacuum heat insulator according to an eleventh aspect of the invention according to the tenth aspect may further comprise a notch formed in the core member that communicates with a space in which the gas adsorbing device is accommodated inside the core member.

According to this configuration, the gas adsorption device can be easily accommodated in the internal space of the core member by inserting the gas adsorption device into the internal space of the core member from the cut of the core member.

A vacuum heat insulator according to a twelfth aspect of the present invention is the vacuum heat insulator according to any of the seventh to eleventh aspects, further comprising a mark attached to a portion of the outer cover member corresponding to a position where the gas adsorption device is disposed. May be.

According to this configuration, when an external force is applied to the position of the gas adsorption device based on the mark, the external force acts on the gas adsorption device. For this reason, the sealing member of the gas adsorption device is broken, and the gas adsorption device is reliably opened (opened).

According to a thirteenth aspect of the present invention, in any of the seventh to twelfth aspects of the present invention, the vacuum heat insulator further includes a movement suppressing portion that is provided in the second internal space of the jacket member and suppresses movement of the gas adsorption device. May be.

According to this configuration, the movement of the gas adsorption device is suppressed by the movement suppressing portion provided in the second internal space of the jacket member. For this reason, the position of the gas adsorbing device can be specified from the outside of the jacket member, and a decrease in productivity is prevented.

In the vacuum heat insulating body according to the fourteenth aspect of the invention, in the thirteenth aspect of the invention, the movement suppressing part may be constituted by an inner bag that encloses part or all of the gas adsorption device.

According to this configuration, the displacement of the gas adsorbing device is suppressed by the friction between the gas adsorbing device and the inner bag in the range covered by the inner bag, and the productivity is prevented from being lowered.

In the vacuum heat insulator according to the fifteenth aspect, in the fourteenth aspect, the inner bag may be made of an elastic material.

According to this configuration, since the gas adsorption device is covered with the inner bag of the elastic material, it is possible to prevent the inner bag from forming scratches or dents on the gas adsorption device.

In the vacuum heat insulator according to the sixteenth invention, in the fifteenth invention, the elastic material may include a nonwoven fabric made of resin.

According to this configuration, the nonwoven fabric formed of resin has little moisture absorption and is not easily torn. For this reason, the fall of the vacuum degree in 2nd internal space is prevented, and the movement of a gas adsorption device is controlled.

In the vacuum heat insulator according to the seventeenth invention, in the sixteenth invention, the resin forming the nonwoven fabric may contain at least one of PP and PET.

According to this configuration, PP and PET have high tensile strength, tear strength, and heat resistance, and are low in cost. For this reason, the movement restriction function is maintained, and a decrease in productivity is prevented.

In a vacuum heat insulator according to an eighteenth aspect of the invention, in any one of the thirteenth to seventeenth aspects of the invention, the movement suppressing portion is configured by an inner surface of a space in which the gas adsorbing device is accommodated inside the core member. Also good.

According to this configuration, in the storage space for the gas adsorption device inside the core member, the movement of the gas adsorption device is regulated by the friction between the core member, which is the body surface of the space, and the gas adsorption device. Is prevented.

According to a nineteenth aspect of the present invention, there is provided a sealed container manufacturing method comprising: storing solid matter in a first internal space of a metal container; and reducing the first internal space of the metal container while performing alkaline earth metal oxidation. The sealing member made of glass containing at least one of a metal and an alkali metal oxide is heated and melted and cooled and solidified to join the sealing member to the opening of the metal container, thereby the sealing member And sealing the opening.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

In the following, the same or corresponding elements are denoted by the same reference symbols throughout all the drawings, and redundant description thereof is omitted.

(Embodiment 1)
FIG. 1 shows a cross-sectional view of a sealed container 1 according to Embodiment 1 of the present invention. The sealed container 1 includes a metal container 3, a solid material 4, and a glass sealing member 2 including at least one of an alkaline earth metal oxide and an alkali metal oxide.

The metal container 3 is a member that forms a decompressed internal space (hereinafter referred to as a first internal space). The metal container 3 is made of a metal that does not transmit water or gas, has high heat resistance, and has a larger thermal expansion coefficient than the sealing member 2. For this metal, for example, aluminum, iron, copper, and stainless steel are used from the viewpoint of cost and availability. However, a metal is not limited to this, It selects suitably according to the intended purpose of the airtight container 1, and the melting temperature of the sealing member 2. FIG. In particular, aluminum is preferable as a material of the metal container 3 because it has a large coefficient of thermal expansion among metals and has a high spreadability compared to other metals.

The metal container 3 is formed in a cylindrical shape including one end that opens (hereinafter referred to as “open end”) and the other end that is closed. The metal container 3 includes an opening 5, and the opening 5 is configured by the opening of the metal container 3 and the vicinity thereof. The diameter of the opening 5 is set to a length that allows the sealing member 2 to be inserted. Here, the narrowed portion 7 is provided in the opening 5.

The narrowed portion 7 is provided between the opening end of the metal container 3 and the solid material 4 and is a portion narrower than the opening (opening end) of the metal container 3. The diameter of the narrowed portion 7 is smaller than the diameter of the opening and is set to a size that can hold the molten sealing member 2. The shape of the narrowed portion 7 is not particularly limited. The interval between the upper end of the narrowed portion 7 and the open end of the metal container 3 may or may not be present. When there is no space, the sealing member 2 is placed on the open end of the metal container 3 before the heat treatment. On the other hand, when there is an interval, the sealing member 2 is inserted into the opening 5 between the opening end of the metal container 3 and the upper end of the narrowed portion 7 before the heat treatment.

The solid material 4 is accommodated in the first internal space of the metal container 3. Examples of the solid material 4 include a support material necessary for holding the decompressed first internal space, or a functional material that needs to be stored in the decompressed first internal space.

The support material includes a core member including many fine spaces. By arranging the core member in the first internal space, even if the first internal space is decompressed, the decompressed first internal space is maintained without collapsing the metal container 3. For example, the core member may be made of a material such as glass wool that has a low heat transfer coefficient and generates less gas by heat treatment under reduced pressure. When such a core member is used as the solid material 4, the sealed container 1 in which the first internal space of the metal container 3 is maintained in a reduced pressure state and the core member is accommodated in the first internal space of the metal container 3. The heat transfer coefficient becomes smaller. For this reason, airtight container 1 itself can be utilized as a vacuum heat insulating body.

Functional materials include gas adsorbents that adsorb gas. The gas adsorbent supports the metal and secures the first internal space when the gas adsorbent is stored in the decompressed first internal space until the sealing member 2 is opened.

The gas adsorbent is made of a material that does not lose its activity due to heat treatment. A substance that is activated by heat treatment under reduced pressure is used as the gas adsorbent. Examples of the gas adsorbent include Ba-based, Ti-based, Zr-based, and Fe-based alloy getters, and copper ion exchanged ZSM-5 type zeolite. In particular, from the viewpoint of management of energy efficiency and gas adsorption performance, copper ion exchange ZSM-5 activated by heat treatment under reduced pressure is preferable as the gas adsorbent.

Regarding the management of gas adsorption performance, the adsorption active site of the copper ion exchange ZSM-5 type zeolite is copper ion. The hue of the copper ion exchanged ZSM-5 type zeolite changes depending on the state in which the copper ions are introduced into the copper ion exchanged ZSM-5 type zeolite. By utilizing this, it is possible to manage the gas adsorption performance of the copper ion exchanged ZSM-5 type zeolite under reduced pressure by the colorimetric value.

The colorimetric value is measured with a commercially available spectral color difference meter. In the spectrocolorimeter, a measurement cell is filled with copper ion exchanged ZSM-5 type zeolite, and the reflectance, absorption rate, transmittance, and the like of light with respect to wavelengths in the range of 380 nm to 760 nm are measured. Based on the measured values, the color coordinates of the copper ion exchanged ZSM-5 type zeolite are obtained.

The range of colorimetric values (color coordinates, reflectance) of copper ion exchanged ZSM-5 type zeolite that exhibits adsorption performance when measured with a colorimetric color difference meter SE6000 (manufactured by Nippon Denshoku Industries Co., Ltd.) is as follows. Indicated. In this case, a C light source was used, and color coordinates were measured at a viewing angle of 2 °. Since the activity of the copper ion exchanged ZSM-5 type zeolite was different before and after the heat treatment, the colorimetric values before and after the heat treatment were obtained. Further, the copper ion exchanged ZSM-5 type zeolite was disposed in the heat insulating body in a state of being accommodated in the metal container 3 and then heat-treated. For this reason, the metal container 3 is taken out from the heat-treated heat insulator, the metal container 3 is destroyed, and the copper ion exchange ZSM-5 type zeolite is taken out from the first internal space, whereby the copper ion exchange after the heat treatment is performed. A ZSM-5 type zeolite was obtained. The copper ion exchanged ZSM-5 type zeolite after the heat treatment was measured with a color difference meter in the same manner as the copper ion exchanged ZSM-5 type zeolite before the heat treatment.

The L *, a *, b * color coordinates of the copper ion exchanged ZSM-5 type zeolite before the heat treatment are, for example, 70 ≧ L * ≧ 96, 0 ≧ a * ≧ −6, −1 ≧ b ≧ −15 If so, the adsorption performance is good. More desirably, if the color coordinates are, for example, 75 ≧ L * ≧ 96, −2.5 ≧ a * ≧ −6, and −1 ≧ b ≧ −10, the adsorption performance is further improved. Further, when the reflectance with respect to light having a wavelength of 380 nm to 580 nm is, for example, 55% or more and 95% or less, good adsorption performance is exhibited. More desirably, if the reflectance with respect to light having a wavelength of 400 nm to 500 nm is 60% or more and 95% or less, even higher adsorption performance is exhibited.

The state of copper ions is changed by the heat treatment, and the color components of the copper ion exchanged ZSM-5 type zeolite after the heat treatment are changed by the air component adsorbed on the copper ion exchanged ZSM-5 type zeolite. For this reason, the L *, a *, b * color coordinates of the copper ion exchanged ZSM-5 type zeolite after the heat treatment are, for example, 88 ≧ L * ≧ 81, 4 ≧ a * ≧ −4, 12 ≧ b ≧ − If it is 4, it is considered that the adsorption performance is good. More desirably, if the color coordinates are 86 ≧ L * ≧ 83, 2 ≧ a * ≧ −2, 10 ≧ b ≧ −2, for example, the adsorption performance is further improved. In addition, when the reflectance with respect to light having a wavelength of 380 nm to 580 nm is, for example, 50% or more and 70% or less, good adsorption performance can be obtained. More desirably, if the reflectance with respect to light having a wavelength of 400 nm to 500 nm is, for example, 50% or more and 70% or less, higher adsorption performance is exhibited.

It can be seen that when the colorimetric value of the copper ion exchanged ZSM-5 type zeolite is in the above range, the copper ion exchanged ZSM-5 type zeolite exhibits excellent gas adsorption performance. Therefore, the gas adsorption performance of the copper ion exchanged ZSM-5 type zeolite is easily determined from the colorimetric values.

The sealing member 2 is made of glass containing at least one of an alkaline earth metal oxide and an alkali metal oxide. Examples of the alkali metal oxide include Na ₂ O, K ₂ O, Rb ₂ O, and Cs ₂ O. Examples of the alkaline earth metal oxide include MgO, CaO, BaO, and SrO. In particular, alkaline earth metal oxides are desirable because they are chemically bonded to the metal container 3 more strongly than alkali metal oxides. Among the alkaline earth metal oxides, BaO and SrO are desirable because chemical bonds with the metal container 3 are stronger. The ionization energy of Ba and Sr is smaller than that of other alkaline earth metal oxides such as Be, Mg, and Ca. For this reason, it is considered that oxygen atoms bonded to Ba and Sr are easily chemically bonded to the metal oxide on the surface of the metal container 3.

The molar ratio of at least one of alkaline earth metal oxide and alkali metal oxide (hereinafter referred to as “alkaline earth metal oxide etc.”) is, for example, 1 to 65%, and 15 to 60%. It is preferable that When there are too many molar ratios, such as an alkaline-earth metal oxide, the sealing member 2 cannot maintain the performance as glass. Moreover, when there are too few molar ratios, such as alkaline-earth metal oxide, joining of the sealing member 2 and the metal containers 3 will become weak.

Note that the molar ratio is obtained, for example, as follows. The sealing member 2 is dissolved with an acid or the like to prepare a sample. The weight of each element contained in this sample is measured by ICP emission spectral analysis or the like. Divide the weight of the element by the atomic weight of the element to find the mole of the element. Since elements exist as oxides in glass, the moles of elements are converted to moles of element oxides. Then, the molar ratio of the alkaline earth metal oxide or the like is determined by the ratio of the mole of the alkaline earth metal oxide or the like to the total amount of the oxides of all the elements.

The joining portion 6 is a layer formed on the surface of the sealing member 2 and is a portion that joins the opening 5 of the metal container 3 in the sealing member 2. The joint 6 is formed by heating and melting the sealing member 2 in the opening 5 of the metal container 3 and solidifying by cooling. The joint portion 6 is a portion where the alkaline earth metal oxide or the like of the sealing member 2 and the metal oxide formed on the surface of the metal container 3 are chemically bonded via oxygen.

Here, the grounds for “chemically bonding” will be explained. The joint 6 is peeled off from the sealing member 2 by being immersed in water and contacting a large amount of water. When this water was analyzed by ICP emission spectroscopic analysis or the like, alkaline earth metal was detected. On the other hand, alkaline earth metal was not detected even when the sealing member 2 alone was immersed in water and this water was analyzed by ICP emission spectroscopic analysis or the like. As a result, it has been found that the bonding portion 6 is formed by chemical bonding unlike the sealing member 2 and has a property of being easily dissolved in water. This chemical bond is considered to be a chemical bond via oxygen caused by the metal oxide and alkaline earth metal oxide formed on the surface of the metal container 3.

[Method of manufacturing sealed container]
FIG. 2 is a perspective view showing the metal container 3 containing the solid material 4 in the first internal space. FIG. 3 shows a state in which the metal container 3 shown in FIG. 2 is crushed. FIG. 4 shows a state in which the sealing member 2 is inserted into the opening 5 of the metal container 3 shown in FIG.

As shown in FIG. 2, the solid material 4 is arranged in the first internal space of the cylindrical metal container 3. As shown in FIG. 3, the metal container 3 is crushed over the entire axial length of the metal container 3 so that the thickness of the metal container 3 is reduced. Thereby, the cross section of the metal container 3 becomes a flat shape of a substantially elliptical shape or a rectangular shape with rounded corners. Then, as shown in FIG. 4, the opening 5 of the metal container 3 is further crushed so as to form a narrowed portion 7. When the sealing member 2 is inserted into the opening 5, the sealing member 2 is held on the narrowed portion 7.

Such a metal container 3 is heated while being decompressed in a vacuum heating furnace. The heating temperature is appropriately determined, and is set to a temperature at which a part or all of the sealing member 2 is melted, for example. Thereby, the first internal space is depressurized to be in a vacuum state, and the sealing member 2 is melted. The melted sealing member 2 flows into the narrowed portion 7 and remains in the narrowed portion 7 due to surface tension or the like. Subsequently, when the temperature is lowered while the vacuum heating furnace is decompressed, the metal container 3 is cooled. Thereby, the molten sealing member 2 is solidified. Further, the thermally expanded metal container 3 contracts.

At this time, the alkaline earth metal oxide or the like contained in the glass sealing member 2 and the metal oxide formed on the surface of the metal container 3 are chemically bonded to each other, thereby opening the opening 5 of the metal container 3. And the sealing member 2 are chemically bonded. Further, since the metal container 3 contracts more than the sealing member 2, the opening 5 of the metal container 3 sandwiches the periphery of the sealing member 2, so that the opening 5 of the metal container 3 and the sealing member 2 are sandwiched. Mechanically joins between the two. By such chemical bonding and mechanical bonding, there is no gap between the opening 5 of the metal container 3 and the sealing member 2, and the opening of the metal container 3 is closed by the sealing member 2. The metal container 3 is sealed. Thereby, the sealed container 1 is formed.

The conditions for the heat treatment and the cooling treatment are not particularly specified, and are appropriately selected depending on the combination of the sealing member 2 and the metal container 3. However, since the heat treatment is performed under reduced pressure, if the heating temperature is too high, a deoxygenation reaction occurs between the glass composition of the sealing member 2 and the metal oxide of the metal container 3. Thereby, the metal contained in the glass composition and the metal of the metal oxide form an alloy, and the alloy may peel off. Therefore, the heating temperature is desirably 700 ° C. or less, for example.

[Action, effect]
According to the sealed container 1 according to the first embodiment, when the glass sealing member 2 is melted by heat treatment, diffusion and movement of elements occur in the glass composition. Thereby, since alkaline earth metal oxide etc. have high affinity with the metal oxide of the surface of the metal container 3, alkaline earth metal oxide etc. increase in the junction part 6 which is contacting with the metal container 3. . And it is thought that the alkaline earth metal oxide etc. of this sealing member 2 and the metal oxide of the metal container 3 form a strong chemical bond via oxygen. As a result, the opening 5 of the metal container 3 and the sealing member 2 are highly airtight and firmly bonded.

Further, the thermal expansion coefficient of the aluminum metal container 3 is larger than the thermal expansion coefficient of the glass sealing member 2. For this reason, in the cooling process after the heat treatment, the aluminum metal container 3 contracts more than the glass sealing member 2 inserted into the opening 5 of the metal container 3. Thereby, the opening part 5 of the metal container 3 fastens the sealing member 2 by the stress generated by the difference between these thermal expansion coefficients. Thereby, the metal container 3 is firmly joined by the sealing member 2, and the airtight container 1 is excellent in airtightness.

Furthermore, the spreadability of the aluminum metal container 3 is greater than the spreadability of the glass sealing member 2. For this reason, when the metal container 3 contracts due to the cooling process, the metal container 3 can be flexible along the shape of the sealing member 2 without destroying the sealing member 2 and without breaking. Deform. As a result, the opening 5 is in close contact with the sealing member 2 in the metal container 3, and a gap is hardly generated between the opening 5 of the metal container 3 and the sealing member 2. Thereby, the metal container 3 is firmly joined by the sealing member 2, and the sealed container 1 is excellent in airtightness.

Furthermore, since the aluminum metal container 3 has spreadability, when an external force is applied to the sealing member 2 from above the metal container 3, the metal container 3 is easily deformed. Thereby, external force is transmitted to the sealing member 2, the sealing member 2 is easily destroyed, and the airtight container 1 is easy to open.

Further, if a gas adsorbent activated by heat treatment is used as the solid material 4, activation of the gas adsorbent and melting of the sealing member 2 are performed by a single heat treatment. For this reason, consumption of the energy of heat processing is suppressed and energy efficiency becomes favorable.

Furthermore, if a gas adsorbent that can be activated in a reduced pressure state is used as the solid material 4, the gas adsorbent can be activated in a state where the first internal space is reduced in pressure. Thereby, the activated gas adsorbent does not adsorb unnecessary gas or moisture, and deterioration of the gas adsorbent is suppressed.

According to the sealed container 1 having the above-described configuration, the molten sealing member 2 is fixed to the narrowed portion 7, and the opening 5 of the metal container 3 and the sealing member 2 are in surface contact. Thereby, since these joining areas are large and these joining forces become strong, the metal container 3 can be reliably sealed.

Further, the narrowed portion 7 is formed by deforming the opening 5 of the metal container 3. For this reason, the melted sealing member 2 can be supported with a simple structure without providing a support portion for the sealing member 2 provided separately from the metal container 3.

Furthermore, when the sealing member 2 is inserted into the opening 5 of the metal container 3 before the heat treatment, the sealing member 2 is supported by the upper end of the narrowed portion 7. Thereby, the sealing member 2 can be arrange | positioned in the opening part 5 easily and reliably.

Hereinafter, the result of evaluating the bonding strength between the sealing member 2 and the metal container 3 in the sealed container 1 will be described. For this evaluation, the sealed containers 1 of Examples 1 to 5 and the sealed container 1 of Comparative Example 1 were used. The bonding strength was evaluated by two methods of appearance evaluation and measurement evaluation. In the appearance evaluation, the sealed container 1 was dropped from a height of 1 m, and whether the sealing member 2 was peeled off from the metal container 3 was visually observed. When the sealing member 2 was peeled off, it was judged that the bonding strength was weak, and when the sealing member 2 was not peeled off, the bonding strength was strong. Moreover, measurement evaluation was performed according to the T-type peel strength test using the Shimadzu autograph. Specifically, the opposing position of the opening 5 of the metal container 3 is fixed to the measurement jig, and the measurement jig is pulled and moved in the direction of widening the opening. Thereby, the opening part 5 deform | transforms and the sealing member 2 peels from the opening part 5. FIG. The tensile strength was determined from the moving distance of the jig and the tensile force at this time.

(Example 1)
In the sealed container 1 of Example 1, the sealing member 2 contains ZnO · P ₂ O ₅ · K ₂ O, the thermal expansion coefficient is 120 × 10 ⁻⁷ / ° C., and the softening temperature is 420 ° C. Was used. The metal container 3 was a cylinder made of SUS301. This SUS301 has a thermal expansion coefficient of 16.9 × 10 ⁻⁶ / ° C. and a hardness of 165 Hv. An alloy-based powder that expresses gas adsorption activity by heat treatment under reduced pressure was used as the solid material 4.

After installing the solid material 4 in the metal container 3, the metal container 3 is crushed almost flat as a whole. The narrow portion 7 is formed by applying an external force so as to narrow the width of the opening 5 of the metal container 3, and the sealing member 2 is disposed on the narrow portion 7. And after desorbing the gas and moisture contained in the gas adsorbent at about 100 ° C. in a vacuum heating furnace, the gas adsorbent is appropriately activated at about 500 ° C., and then at 550 ° C. The sealing member 2 was melted. After this heat treatment, the vacuum heating furnace was allowed to cool to room temperature in a vacuum state, and the sealed container 1 was created.

In the sealed container 1 created in this way, the sealing member 2 was joined to the metal container 3, and there was no gap between the sealing member 2 and the metal container 3. In the appearance evaluation after dropping the sealed container 1, it was evaluated that there was no gap between the sealing member 2 and the metal container 3 and the tangential strength was high. This high bonding strength is considered to be due to chemical bonding by chemical bonding in the bonding portion 6 and mechanical bonding by tightening the metal container 3. Moreover, in measurement evaluation of the airtight container 1, peeling strength was 0.80 N / mm < ² >.

(Example 2)
The airtight container 1 of Example 2 is the same as the airtight container 1 of Example 1, but the sealing member 2 and the solid material 4, but the metal container 3 is different. For the metal container 3, a cylinder made of copper having a thermal expansion coefficient of 17.0 × 10 ⁻⁶ / ° C. and a hardness of 46 Hv was used. The method for producing the sealed container 1 of the second embodiment is the same as that of the sealed container 1 of the first embodiment.

In the sealed container 1 that was created, there was no gap between the sealing member 2 and the metal container 3. In the appearance evaluation after dropping the sealed container 1, it was evaluated that there was no gap between the sealing member 2 and the metal container 3 and the tangential strength was high. This high bonding strength is considered to be due to chemical bonding by chemical bonding in the bonding portion 6 and mechanical bonding by tightening the metal container 3.

Moreover, in measurement evaluation of the airtight container 1, peeling strength was 1.0 N / mm < ² >. This peel strength is greater than the peel strength of Example 1. This is presumably because copper is easier to form a metal oxide layer on the surface than SUS301, and is thus strongly chemically bonded to K ₂ O of the sealing member 2.

Note that the hardness of copper is lower than that of SUS301. For this reason, when an external force is applied to the metallic container 3 made of copper, the force is transmitted to the sealing member 2 and the sealing member 2 is easily broken. For this reason, the airtight container 1 is easily opened.

(Example 3)
The airtight container 1 of Example 3 is the same as the airtight container 1 of Example 1, but the sealing member 2 and the solid material 4, but the metal container 3 is different. As the metal container 3, a cylinder made of aluminum having a thermal expansion coefficient of 23.9 × 10 ⁻⁶ / ° C. and a hardness of 25 Hv was used. The method for producing the sealed container 1 of the third embodiment is the same as that of the sealed container 1 of the first embodiment.

Moreover, in measurement evaluation of the airtight container 1, peeling strength was 1.1 N / mm < ² >. This peel strength is greater than those of Examples 1 and 2. This is presumably because aluminum is more likely to form a metal oxide layer on the surface than SUS301 and copper, and thus is strongly chemically bonded to K ₂ O of the sealing member 2.

(Example 4)
The sealed container 1 of Example 4 is the same as the sealed container 1 of Example 3, but the solid material 4 and the metal container 3, but the sealing member 2 is different. A glass containing ZnO.P ₂ O ₅ .CaO, a thermal expansion coefficient of 80 × 10 ⁻⁷ / ° C., and a softening temperature of 500 ° C. was used for the sealing member 2. Moreover, the production method of the airtight container 1 of Example 4 is the same as that of the airtight container 1 of Example 1 except heat processing. In the heat treatment of Example 4, after desorbing gas and moisture contained in the gas adsorbent at about 100 ° C., the gas adsorbent is appropriately activated at about 580 ° C., and then at 620 ° C. The sealing member 2 was melted.

Moreover, in measurement evaluation of the airtight container 1, peeling strength was 1.4 N / mm < ² >. This peel strength is greater than the peel strength of Example 3. This is presumably because the alkaline earth metal CaO of the sealing member 2 is more strongly chemically bonded to the metal oxide on the surface of the metal container 3 than the alkali metal K ₂ O.

(Example 5)
The airtight container 1 of Example 5 is the same as the airtight container 1 of Example 3, but the solid material 4 and the metal container 3, but the sealing member 2 is different. A glass containing Bi ₂ O ₂ .B ₂ O ₃ .SrO.BaO.ZnO, a thermal expansion coefficient of 110 × 10 ⁻⁷ / ° C., and a softening temperature of 420 ° C. was used as the sealing member 2. Moreover, the preparation method of the airtight container 1 of Example 5 is the same as that of the airtight container 1 of Example 1 except heat processing. In the heat treatment of Example 5, after desorbing gas and moisture contained in the gas adsorbent at about 100 ° C., the gas adsorbent is appropriately activated at about 500 ° C., and then at 600 ° C. The sealing member 2 was melted.

Moreover, in measurement evaluation of the airtight container 1, peeling strength was 2.0 N / mm < ² >. This peel strength is greater than the peel strength of Example 4. This is considered to be because SrO and BaO of the sealing member 2 are strongly chemically bonded to the metal oxide on the surface of the metal container 3 from CaO.

(Comparative example)
The airtight container of the comparative example is the same as the airtight container 1 of Example 5, but the metal container, the sealing member, and the solid are the same, but the method for producing the airtight container is different. That is, in the sealed container 1 of Example 5, the metal container 3 that was crushed substantially flat and in which the narrowed portion 7 was formed in the opening 5 was used. The sealing member 2 entered the narrow portion 7 in the metal container 3, where the sealing member 2 was chemically bonded to the metal container 3 to form a joint 6 that spreads in a planar shape. On the other hand, in the sealed container of the comparative example, a cylindrical metal container was used. The sealing member did not enter the metallic container, and the opening end of the metallic container and the sealing member were joined to form a linear joint 6.

In the created sealed container, there was no gap between the sealing member and the metal container. However, in the appearance evaluation after dropping the sealed container, it was evaluated that the sealing member peeled from the metal container and the tangential strength was low. This low bonding strength is considered to be due to the fact that the area of the chemical bond is small and there is no mechanical bonding by tightening the metal container.

[Modification 1]
Although the constriction 7 is provided in the opening 5 of the metal container 3 shown in FIG. 1, the constriction 7 may not be provided in the opening 5 as shown in FIG. In this case, what supports the molten sealing member 2 is provided between the opening and the solid material 4. For example, an inorganic fiber aggregate, a filter, or a protrusion having air permeability and heat resistance is used for the support portion. When the metal container 3 provided with the support portion is subjected to heat treatment, the support portion supports the molten sealing member 2. Thereby, the sealing member 2 is hold | maintained at the opening part 5 of the metal container 3, and the opening of the metal container 3 can be sealed reliably. The protrusion protrudes inward from the opening 5 in the direction in which the diameter of the opening 5 of the metal container 3 decreases. The height of the protrusion is determined by the viscosity of the molten sealing member 2 and the like. The protrusion may be formed integrally with the metal container 3 or may be formed by attaching a member formed separately from the metal container 3 to the inside of the metal container 3.

[Modification 2]
Although the metal container 3 shown in FIG. 1 is crushed into a substantially flat shape, a cylindrical metal container 3 may be used as shown in FIG. Although the narrowed portion 7 is provided in the opening 5, a member for supporting the molten sealing member 2 may not be provided. In this case, the size of the opening 5 may be set smaller than the size of the sealing member 2 before the heat treatment. In this case, the sealing member 2 can be disposed on the open end of the metal container 3 before the heat treatment.

(Embodiment 2)
[Configuration of vacuum insulation]
FIG. 1 is a cross-sectional view schematically showing a vacuum heat insulating body 8 according to Embodiment 2 of the present invention.

The vacuum heat insulator 8 accommodates the sealed container 1 as the gas adsorption device 1, the core member 9, the gas adsorption device 1 and the core member 9 in the second internal space, and the second internal space is decompressed and sealed. An outer cover member 10.

The jacket member 10 is hollow and has a so-called vacuum internal space (hereinafter referred to as a second internal space). Here, so-called vacuum is a state where the pressure is lower than the atmospheric pressure. For example, the degree of vacuum in the second internal space is 1 to 200 Pa. The jacket member 10 is made of a gas barrier film that blocks water or gas from entering the second internal space. This gas barrier property is, for example, a gas permeability of 104 [cm ³ / m ² · day · atm] or less, desirably 103 [cm ³ / m ² · day · atm] or less, and more desirably 102. [Cm ³ / m ² · day · atm] or less. For example, a laminate film in which a resin film and an aluminum foil are laminated is used for the jacket member 10.
A laminate film is a sheet obtained by laminating a laminate. The laminate is a sheet in which an innermost layer heat-welded film, an intermediate layer gas barrier film, and a surface protective film as an outermost layer are laminated.

The innermost layer heat welding film is not particularly specified, but for example, a thermoplastic resin or a mixture thereof is used. Examples of the thermoplastic resin include a low density polyethylene film, a linear low density polyethylene film, a high density polyethylene film, a polypropylene film, and a polyacrylonitrile film.

The gas barrier film of the intermediate layer is not particularly specified, but for example, a metal foil or a metal vapor deposition film is used. Examples of the metal foil include aluminum foil and copper foil. A metal vapor deposition film is formed by vapor-depositing metals and metal oxides, such as aluminum and copper, on a resin film, for example. Examples of the resin of the resin film include a polyethylene terephthalate film and an ethylene-vinyl alcohol copolymer.

The outermost surface protective film is not particularly specified, and for example, a resin film such as a nylon film, a polyethylene terephthalate film, or a polypropylene film is used.

The core member 9 is a skeleton member of the vacuum heat insulator 8 that is accommodated in the second internal space of the jacket member 10 and maintains the vacuum second internal space. In the vacuum second internal space of the jacket member 10, the core member 9 has a large number of minute spaces inside and supports the jacket member 10 to hold the inner space of the jacket member 10. The core member 9 is a porous substance, and can be made of open cells of polymer materials such as polystyrene and polyurethane, open cells of inorganic materials, inorganic and organic powders, inorganic and organic fiber materials, and the like. For the core member 9, for example, a fiber having low thermal conductivity, high heat resistance, and less gas generation in a vacuum state or a high temperature state is used. Examples of the fibers include inorganic fibers such as glass wool, rock wool, alumina fibers, and metal fibers, and resin fibers such as polyethylene terephthalate. Among these, glass wool is preferable because it has high elasticity, low thermal conductivity, and is industrially inexpensive. Moreover, the thinner the fiber, the lower the thermal conductivity of the vacuum heat insulating body 8, and a fine fiber is preferable. However, since the fiber becomes expensive, the diameter of the fiber is selected in consideration of the cost and the heat traditional rate. For example, a relatively inexpensive aggregate of glass wool having an average fiber diameter of about 3 μm to 6 μm that is generally used as a fiber for the vacuum heat insulator 8 is desirable.

The core member 9 has a three-dimensional shape, for example, a substantially rectangular parallelepiped shape with a small thickness. The core member 9 is composed of one fiber sheet or a plurality of laminated thin fiber sheets. In the core member 9 in which a plurality of fiber sheets are laminated, a cut 11 extending in the lamination direction is provided.

The notch 11 is an insertion port for inserting the gas adsorption device 1 into the core member 9 and communicates with the space in which the gas adsorption device 1 is stored. The cut 11 is a cut provided perpendicular to the surface of the core member 9 and has, for example, a rectangular shape. The width of the cut 11 parallel to the surface of the core member 9 is larger than the width of the gas adsorption device 1. The notch 11 extends inward from the surface of the core member 9, and since the depth perpendicular to the surface of the core member 9 is greater than the thickness of the one or more fiber sheets, one or more fiber sheets are cut.

The storage space 12 of the gas adsorption device 1 is provided inside the core member 9. The storage space 12 of the gas adsorption device 1 may be formed by cutting the core member 9 or may be formed in advance inside the core member 9. When the storage space 12 of the gas adsorption device 1 is formed by cutting the core member 9, the fiber sheet cut by the notch 11 is peeled off, and the tear 12 formed thereby is used as the storage space 12. The tear 12 is parallel to the surface of the core member 9 and is formed between the laminated fiber sheets. The tears 12 and the notches 11 are connected in an L shape in a direction perpendicular to the surface of the core member 9. For this reason, the gas adsorption device 1 is inserted into the slit 12 from the cut 11.

The gas adsorption device 1 is a member for adsorbing a gas heat conduction component that remains or enters the second internal space of the jacket member 10. The gas adsorbent is stored in the first internal space of the metal container 3, the first internal space is decompressed, and the opening 5 of the metal container 3 is sealed with the sealing member 2. As the gas adsorbent, a chemical adsorption material such as calcium oxide or magnesium oxide, a physical adsorption material such as zeolite, or a mixture thereof can be used. Further, ZSM-5 type zeolite exchanged with copper ions having chemical adsorption properties and physical adsorption properties can also be used. The metal container 3 is made of aluminum, copper metal, resin, or the like. The sealing member 2 is made of a material that can seal the metallic container and is more fragile than the metallic container 3, and for example, glass containing an alkali metal oxide or an alkaline earth metal oxide is used.

The gas adsorption device 1 is housed in a tear 12 formed inside the core member 9. As for the gas adsorption device 1, the shape of the gas adsorption device 1 is not specifically limited, For example, you may match | combine with the shape of the vacuum heat insulating body 8. FIG. For example, the shape of the gas adsorption device 1 having a substantially flat cross-sectional shape with a width larger than the thickness is used for the vacuum insulation body 8 with a small thickness and a substantially flat shape. In this case, in the gas adsorption device 1, the short axis (thickness) of the substantially flat cross section is in the thickness direction of the vacuum heat insulating body 8, and the long axis (width) of the substantially flat cross section is parallel to the surface of the vacuum heat insulating body 8. Arranged. Thereby, the gas adsorption device 1 is disposed so that the minor axis (thickness) of the substantially flat cross section is in the thickness direction of the vacuum heat insulating body 8. A mark 13 is provided on a portion of the surface of the vacuum heat insulating agent corresponding to the arrangement position of the gas adsorption device 1.

The mark 13 is a mark indicating the position of the gas adsorption device 1 disposed inside the outer cover member 10, particularly the position of the opening 5 of the gas adsorption device 1. The mark 13 is attached to a portion of the jacket member 10 that is opposite to (corresponding to) the portion where the gas adsorption device 1 is disposed. The type and shape of the mark 13 are not particularly limited as long as the position of the gas adsorption device 1 can be seen from the outside of the jacket member 10. For example, the mark 13 may be a mark written on the outer surface of the jacket member 10 or a seal attached to the outer surface of the jacket member 10. For example, the mark 13 may be printed on the jacket member 10 when the jacket member 10 is manufactured or when the lot number is marked 13 on the vacuum heat insulating body 8. Further, after manufacturing the vacuum heat insulating body 8, a person may mark the mark 13 using ink or the like.

Also, the mark 13 at the installation position of the gas adsorbing device 1, particularly the position where the sealing portion 9 is located, is printed on the jacket member 106, and is the position to apply external force when the gas adsorbing device 1 is opened.

[Manufacture of vacuum insulation]
The manufacturing method of the vacuum heat insulating body 8 is not specifically limited. For example, the core member 9 is cut upward from the surface of the core member 9 with the surface of the core member 9 facing upward, and a cut is formed in the core member 9. When the fiber sheet cut by the notch 11 is peeled off, the fiber sheet is peeled off and a tear 12 is formed inside the core member 9. When the gas adsorbing device 1 is inserted into the slit 12 from the cut 11, the gas adsorbing device 1 is accommodated in the slit 12. At this time, the gas adsorption device 1 is inserted into the notch 11 from the front end portion of the gas adsorption device 1 where the sealing member 2 is arranged, so that the rear end portion of the gas adsorption device 1 is arranged in the vicinity of the notch 11. The gas adsorption device 1 is arranged in the core member 9 so that the minor axis (thickness) of the substantially flat cross section is in the thickness direction of the core member 9. This cut 11 restricts movement in a direction parallel to the surface of the core member 9 of the gas adsorption device 1.

Also, fold one laminate film so that the innermost heat-sealing film is inside. Thereby, when the two sides of the laminated laminate film are heated and the heat welding films are welded to each other, a bag-like laminate film having one side opened is formed. The core member 9 in which the gas adsorbing device 1 is accommodated is inserted through the opening, and the laminate is placed under reduced pressure in a chamber to which a vacuum pump is connected. When the pressure in the chamber is reduced to about 10 Pa, the heat-welded films are heat-welded so as to close the opening of the bag-like laminate film. Thereby, the jacket member 10 is sealed in a state where the second internal space is evacuated. A mark 13 is provided on the outer cover member 10, and the mark 13 is arranged at a position corresponding to the gas adsorption device 1. Thus, the vacuum heat insulating body 8 whose second internal space is vacuum is completed.

In addition, in manufacture of said vacuum heat insulating body 8, the jacket member 10 was formed by making one laminated film close three ways. On the other hand, the jacket member 10 is similarly formed by closing the two laminated films on all sides.

[Use of vacuum insulation]
About the vacuum heat insulating body 8 comprised as mentioned above, the operation | movement is demonstrated below. FIG. 8 is a perspective view showing the gas adsorption device 1 accommodated in the vacuum heat insulating body 8. FIG. 9 is a perspective view showing the deformed gas adsorption device 1.

As shown in FIG. 7, when the vacuum heat insulating body 8 is placed with the mark 13 facing upward and an external force in a direction parallel to the substantially flat cross section is applied toward the mark 13, the jacket member 10 and the core member 9 are Pushed in. The external force acts on the sealing member 2 of the gas adsorption device 1 located at a position corresponding to the mark 13. In the gas adsorbing device 1 shown in FIG. 8, the metal container 3 is bent and deformed as shown in FIG. And external force acts on the sealing member 2, and the weak sealing member 2 is destroyed. Thereby, the through-hole 14 is formed in the sealing member 2, and the first internal space in the metal container 3 and the second internal space outside the metal container 3 communicate with each other. Therefore, the gas adsorbent in the first internal space adsorbs the gas heat conduction component remaining in the second internal space and the gas heat transfer component entering the second internal space. As a result, the second internal space is maintained in a vacuum state, for example, 1 Pa or less, and the vacuum heat insulating body 8 can maintain excellent heat insulating performance.

[Action, effect]
According to the above configuration, the gas adsorption device 1 is accommodated in the second internal space of the jacket member 10, whereby the second internal space is maintained in a vacuum state. For this reason, the fall of the heat insulation performance of the vacuum heat insulating body 8 is prevented.

Further, since the mark 13 is provided at a position corresponding to the arrangement position of the gas adsorption device 1, when an external force is applied to the mark 13 as a mark, the sealing member 2 is surely broken. For this reason, the function of the gas adsorption device 1 is demonstrated in the vacuum heat insulating body 8, and the vacuum degree of the vacuum heat insulating body 8, and by extension, heat insulation is maintained.

Furthermore, since the gas adsorption device 1 is opened by an external force, it is not necessary to provide an instrument for opening the gas adsorption device 1, and the adsorption device can be opened easily and reliably. Further, the opening member raises the surface of the vacuum heat insulating body 8, and the outer member 106 is rubbed and broken.

Further, the sealing member 2 is broken inside the jacket member 10 and the through hole 14 is formed, so that the performance of the gas adsorption device 1 is exhibited. For this reason, for example, in order to investigate the cause of the vacuum heat insulating body 8 such as poor performance, the gas adsorption device 1 is taken out from the vacuum heat insulating body 8, and the formation state of the through hole 14 in the sealing member 2 is determined. By looking, it can be confirmed whether the adsorption device is functioning.

Furthermore, since the gas adsorbing device 1 is installed inside the core member 9, the core member 9 serves as a buffer material, and the gas adsorbing device 1 is prevented from being unsealed.

In addition, the opening 5 of the metal container 3 of the gas adsorption device 1 is formed in a cylindrical shape including a substantially flat cross section, and the gas adsorption device 1 has a substantially flat short axis perpendicular to the surface of the vacuum heat insulator 8. Is arranged. For this reason, when an external force is applied in a direction parallel to the substantially flat cross section, a force that the external force bends the sealing member 2 against the opening 5 acts in the direction of the substantially flat short axis. The strength of the opening 5 and the sealing member 2 with respect to the external force in the substantially flat short axis direction is smaller than that of the substantially flat long axis direction. Thereby, the sealing member 2 is easily broken on each axis, and the through hole 14 is formed.

Furthermore, the notch 11 formed in the core member 9 leads to the tear 12 inside the core member 9. For this reason, the gas adsorbent is inserted into the slit 12 from the cut 11, and the gas adsorption device 1 is accommodated in the space of the slit 12. This cut 11 restricts movement in a direction parallel to the surface of the core member 9 of the gas adsorption device 1.

[Modification 3]
In the vacuum heat insulating body 8 according to the second embodiment, the mark 13 is a mark or seal attached to the outer surface of the jacket member 10. However, the mark 13 may be a concave portion, a convex portion, a notch, or the like that appears on the jacket member 10. For this reason, the notch 11 of the core member 9 can also be the mark 13 of the installation position of the gas adsorption device 1. In addition, as shown in FIG. 10, by accommodating the gas adsorption device 1 inside the core member 9, the surface of the core member 9 swells outside in a range corresponding to the gas adsorption device 1. Since this bulge appears on the jacket member 10, this bulge is also used for the mark 13 indicating the position of the gas adsorption device 1. Furthermore, as shown in FIG. 11, when the hollow is formed in the core member 9 and the gas adsorbing device 1 is accommodated in the hollow, the hollow appears in the outer cover member 10. Used as a mark 13 indicating the position.

[Modification 4]
In the vacuum heat insulating body 8 according to the second embodiment, the gas adsorption device 1 is accommodated inside the core member 9. On the other hand, the gas adsorption device 1 may be disposed on the surface of the core member 9. In this case, the notch 11 and the accommodating space 12 for the gas adsorption device are not provided.

(Embodiment 3)
In the second embodiment, the gas adsorption device 1 is provided in the vacuum heat insulating body 8. On the other hand, in Embodiment 3, the gas adsorption device 1 is accommodated in the inner bag 15, and the moisture adsorbent 16 is further provided in the vacuum heat insulator 8.

[Configuration of vacuum insulation]
FIG. 12 is a cross-sectional view showing the vacuum heat insulating body 8 according to the third embodiment.

The inner bag 15 is a movement suppression unit that is provided in the second internal space of the jacket member 10 and suppresses the positional deviation of the gas adsorption device 1. The inner bag 15 is made of a material having a high frictional force, for example, a nonwoven fabric made of a resin such as Japanese paper or PE. In particular, the inner bag 15 is made of an elastic material, and examples of the elastic material include a nonwoven fabric made of a resin such as PP and PET. Since this elastic material is soft and difficult to deform, the inner bag 15 prevents the gas adsorbing device 1 from causing abnormal appearance such as scratches and dents. Moreover, the nonwoven fabric comprised with resin is preferable from the point that it is hard to contain a water | moisture content compared with Japanese paper, and torn easily. In particular, a nonwoven fabric composed of PP and PET is preferable because it has high tensile strength, tear strength, and heat resistance, and is low in cost, and can be manufactured by inexpensive and simple production processing.

The inner bag 15 contains part or all of the gas adsorption device 1. The inner bag 15 has a three-way closed shape or a four-way closed shape. When the inner bag 15 is closed on all sides, a material having air permeability is used for the inner bag 15. The inner bag 15 that is closed on all sides is preferable because the gas adsorption device 1 is unlikely to come off.

The moisture adsorbent 16 is a material that adsorbs water vapor that remains or enters the second internal space of the vacuum heat insulator 8. As the moisture adsorbent 16, for example, a chemical adsorbent such as calcium oxide or magnesium oxide, a physical adsorbent such as zeolite, or a mixture thereof is used.

[Action, effect]
According to the above configuration, the gas adsorption device 1 is wrapped in the inner bag 15. Accordingly, when the gas adsorbing device 1 is installed in the core member 9, or when the core member 9 is wrapped with the outer cover member 10, the position of the gas adsorbing device 1 is caused by friction between the inner bag 15 and the core member 9. Is prevented from shifting. Thereby, the position of the sealing member 2 of the gas adsorption device 1 can be easily specified, and the decrease in productivity is suppressed. Moreover, an external force is reliably applied to the gas adsorption device 1, and the gas adsorption device 1 is opened.

Furthermore, since the inner bag 15 serves as a buffer material for the gas adsorption device 1, erroneous opening of the gas adsorption device 1 is reduced.

Further, since the position of the gas adsorbing device 1 is prevented from being shifted by the bag, it is possible to prevent the outer cover member 10 from being rubbed and torn against the gas adsorbing device 1 that has been displaced.

Furthermore, the gas adsorption device 1 and the moisture adsorbent 16 are used in combination. Thereby, the water | moisture content of the gas of the 2nd internal space of the vacuum heat insulating body 8 is adsorb | sucked previously with the cheap water | moisture-content adsorption agent 16. FIG. Thereafter, when the gas adsorption device 1 is opened, a gas other than moisture is adsorbed in the second internal space by the gas adsorption device 1. For this reason, the usage-amount of an expensive gas adsorption material reduces, and cost is reduced.

[Modification 5]
In addition, the water | moisture-content adsorption agent 16 does not need to be provided in the vacuum heat insulating body 8 which concerns on the said Embodiment 3. FIG.

[Modification 6]
Furthermore, the mark 13 according to the second embodiment may be attached to the jacket member 10 of the vacuum heat insulating body 8 according to the third embodiment. By this mark 13, the position of the sealing member 2 of the gas adsorption device 1 can be easily recognized from the outside.

[Modification 7]
In addition, as shown in FIG. 13, the core member 9 of the vacuum heat insulating body 8 according to the third embodiment may be provided with a notch and a space for accommodating the gas adsorption device 1 according to the second embodiment. In this case, the gas adsorption device 1 wrapped in the inner bag 15 is accommodated in the accommodation space 12 inside the core member 9. In addition to the friction between the gas adsorption device 1 and the inner bag 15, the movement of the gas adsorption device 1 is regulated by the friction between the inner bag 15 and the inner surface of the storage space 12. Thereby, in addition to the inner bag 15, the inner surface of the space in which the gas adsorbing device 1 is stored functions as a movement suppressing unit.

[Modification 8]
Furthermore, in the vacuum heat insulating body 8 according to the third embodiment, the sealing member 2 of the gas adsorption device 1 is broken and opened by an external force. However, the opening member of the gas adsorption device 1 may be provided in the vacuum heat insulating body 8.

[Modification 9]
Moreover, although the inner bag 15 which wraps the gas adsorption device 1 was provided in the vacuum heat insulating body 8 which concerns on the said Embodiment 3, the inner bag 15 does not need to be provided. In this case, when the gas adsorption device 1 is accommodated in the core member 9, the movement of the gas adsorption device 1 is regulated by friction with the inner surface of the accommodation space 12. Thereby, the inner surface of the space in which the gas adsorption device 1 is accommodated functions as a movement suppressing unit. Further, the core member 9 is always sandwiched between the gas adsorption device 1 and the jacket member 10. Accordingly, when the sealing member 2 is pressed against the opening member or the like, the elastic core member 9 existing between the sealing member 2 and the outer cover member 10 softens the impact of the external force. For this reason, although the sealing member 2 is destroyed by external force, scattering of the fragment of the sealing member 2 is prevented. Therefore, the fragments of the sealing member 2 do not enter the core member 9 except between the sealing member 2 and the jacket member 10. As a result, when the vacuum insulator 8 is discarded, the respective members can be easily separated, and the recyclability is improved. Depending on how the sealing member 2 is destroyed, the core member 9 between the sealing member 2 and the outer cover member 10 may include fragments of the sealing member 2. In this case, the vacuum heat insulator 8 can be separated by removing the core member 9 between the sealing member 2 and the jacket member 10 from the other core members 9. Moreover, the core member 9 between the sealing member 2 and the jacket member 10 and the other core member 9 may be separated in advance. In this case, the vacuum insulator 8 can be more easily separated.

[Modification 10]
In the vacuum heat insulating body 8 according to the third embodiment, the gas adsorption device 1 is accommodated inside the core member 9. On the other hand, the gas adsorption device 1 may be disposed on the surface of the core member 9.

The sealed container, the manufacturing method thereof, and the vacuum heat insulating body of the present invention can be applied to a sealed container, a manufacturing method thereof, a vacuum heat insulating body, and the like in which a decrease in the degree of vacuum in the internal space containing the solid matter is suppressed.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Sealing member 3 Metal container 4 Solid substance 5 Opening part 6 Joint part 7 Narrow part 8 Vacuum heat insulating body 9 Core member 10 Outer member 11 Notch 12 Rupture 12 Space 13 Mark 14 Through-hole 15 Inner bag 16 Moisture Adsorbent

Claims

A metal container having an opening, the first internal space of which is decompressed;
A solid contained in the first internal space of the metal container;
A sealing member made of glass containing at least one of an alkaline earth metal oxide and an alkali metal oxide, and
An airtight container in which the sealing member is heated and melted and cooled and solidified to join the opening of the metal container and seal the opening.
The sealed container according to claim 1, wherein the alkaline earth metal oxide of the sealing member is one of BaO and SrO.
The said sealing member is located in the inside of the said opening part, and is joined to the said opening part, The said metal container has a thermal expansion coefficient larger than the thermal expansion coefficient of the said sealing member. A sealed container according to 1.
The sealed container according to any one of claims 1 to 3, wherein the metal container is made of aluminum.
A narrow portion is provided in the opening of the metal container,
The sealed container according to any one of claims 1 to 4, wherein the sealing member is bonded to the narrowed portion to seal the narrowed portion.
The sealed container according to any one of claims 1 to 5, wherein the solid material includes a gas adsorbent that does not deteriorate by heat treatment, and functions as a gas adsorption device.
A gas adsorption device comprising the sealed container according to claim 6;
A core member;
A vacuum heat insulating body, comprising: the gas adsorbing device and the core member housed in a second inner space thereof; and a hollow jacket member in which the second inner space is decompressed and sealed.
The vacuum heat insulating body according to claim 7, wherein a through-hole for opening the gas adsorbing device is formed by breaking the sealing member in the second internal space of the jacket member.
The opening of the metal container is formed in a cylindrical shape having a substantially flat cross section,
The vacuum insulation according to claim 8, wherein an external force in a minor axis direction having a substantially flat cross section is applied to the opening, and the through hole is formed by breaking the sealing member. body.
The vacuum heat insulating body according to any one of claims 7 to 9, wherein the gas adsorbing device is housed inside the core member, and the core member is interposed between the jacket member and the gas adsorbing device. .
The vacuum heat insulating body according to claim 10, further comprising a notch formed in the core member that communicates with a space in which the gas adsorbing device is accommodated inside the core member.
The vacuum heat insulating body according to any one of claims 7 to 11, further comprising a mark attached to a portion of the jacket member corresponding to a portion where the gas adsorption device is disposed.
The vacuum heat insulating body according to any one of claims 7 to 12, further comprising a movement suppression unit that is provided in a second internal space of the jacket member and suppresses movement of the gas adsorption device.
The vacuum heat insulator according to claim 13, wherein the movement suppressing unit is configured by an inner bag that includes a part or all of the gas adsorption device.
The vacuum insulator according to claim 14, wherein the inner bag is made of an elastic material.
The vacuum heat insulating body according to claim 15, wherein the elastic material includes a nonwoven fabric made of resin.
The vacuum heat insulating body according to claim 16, wherein the resin forming the nonwoven fabric includes at least one of PP and PET.
The vacuum heat insulator according to any one of claims 13 to 17, wherein the movement suppressing unit is configured by an inner surface of a space in which the gas adsorption device is accommodated inside the core member.
Containing solids in the first internal space of the metal container;
While sealing the first internal space of the metal container, the sealing member made of glass containing at least one of alkaline earth metal oxide and alkali metal oxide is heated and melted to be cooled and solidified. A method of manufacturing an airtight container, comprising joining a member to an opening of the metal container and thereby sealing the opening with the sealing member.